| Abbreviation | Definition |
|---|---|
| SEEMO | South East Europe Media Organisation |
| SEG | Special Effect Generator |
| SEG | Survivor Entertainment Group |
| SEL | Serial Experiments Lain |
| SEMN | South East Media Network |
| SEN | Sport Entertainment Network |
| SER | Sociedad Española de Radiodifusion |
| SERA | Super Extra Really Awesome/and in some corners mean-spirited meaning has meandered menacingly to; 'awfoulsum', Ed/FMF 09/95/13 |
| SERT | Society of Electric and Radio Technicians |
| SF | Samuel Freeman |
| SF | Science Fiction |
| SF | Speculative Fiction |
| SF | The Sophomore Freshman |
| SFA | Scientific Film Association |
| SFAMA | San Francisco Chapter of the American Marketing Association |
| SFB | San Francisco Band |
| SFB | Swainsboro Forest Blade |
| SFD | Society of Film Distributors |
| SFFS | Sisters Forever, Forever Sisters |
| SFN | Science Fiction News |